Excavator



Sept. 22, 1 936. H. slEBERT f' ExcAvA'ToR Filed Aug. s, 1934 2 Sheets-Shee't 2 llllillh.. |I Il.

Inventor ,//e inria/IL Siebert .dttorney.

Patented Sept. 22, 1936 l EXCAVATOB Heinrich Siebert, Duisburg, Germany, assigner to Demag Aktiengesellschaft, Duisburg, Germany Application August 3, 1934, Serial No. 738,227 In Germany August 12, 1933 4 Claims. (Cl. 214-140) 'Ihe invention relates to an excavator, the shovel of which during the digging movement is maintained in determined relation to the haft by means of stops or projecting members applied 5 on the haft, while after thepdigging movement is completed the shovel can be emptied irrespective of the position of the haft.

The invention `consists in simplified means for controlling the shovel, the stops or projecting l members by means of which the shovel is maintained in iixed relation to the haft being controlled by the shovel. tipping mechanism, but more particularly by the tipping rope or cable itself. l The invention is diagrammatically illustrated by way of example in the accompanying drawings.

Figures 1 to 3 show the jib system of the excavator according to the invention, in three different positions. y

Figures 4 and 5 show .the haft and shovel.

Figures` 6 -and 7 illustrate a modification of construction of the stops or projecting members and Figure 8 a modification of construction of the guide for the tipping rope or cable.

As in known constructions of shovel excavators the excavator according to the invention comprises a jib I which is provided capable of luiing on the spindle 2. At its upper end the jib carries the shovel haft 3, which is pivotally connected at 4 to the jib I. The excavator shovel A5 is capable of a swinging movement on the haft 3 about the spindle 6. During the digging operation, a segmental member 1, which may be a rail,

a guide slot or the like, bears against a stop or projecting member 8; the latter may be replaced by a clamping device, a lock or brake. A tipping rope or cable I0 is made fast to the excavator shovel at the front side, approximately atthe position 9; the rope or cable I0 then passes over the pulleys I I, I2, I3 and is'operated by means of a movable pulley I4. The operation of the members hereinbefore describedis effected from the operators hut by means of a chain I5 or by a similar drive having an intermediate spindle lying coaxially with the jib spindle 2 andl whichA drives a pump I6. 'I'he pressure medium from the pump I6 (a liquid or air under pressure) is fed to a`cylinder Il, the piston within the cylinder I1 having a rod I8 connected to the carrier of the pulley I4. The pipes connecting the pump ,I5 to the cylinder I1v are connected through a control member I 9 serving to couple the pipes together either transversely or in parallel, and in its middle. position providing a short-circuit tion the rope or cable I0 is loose.

connection between the two pipes coming from the cylinder I1. Furthermore, the control member I9 may be adapted to take up a position in which both sides of the cylinder I1 are obstructed. This applies, however, only to an 5 intermediate position. The hydraulic driving gear and its control. mechanism do not constitute the subject-matter of the present invention, and may be replaced by any other suitable gearing. such, for example, as a Winch. 10

The mechanism operates as follows:-

According to Figure 1, during the digging movement the stops or projecting members 8 are engaged by the segmental member or rail I which takes up a position in advance of the stops 15 or projecting members in the movement of the shovel to the digging position in relation to the haft 3.- The shovel is thus supported against` the resistance oiered by the earth in the digging operation. After the completion of the digging 20 movement, the haft 3 takes up its innermost position. As the resistance of the earth is no longer eiiective, the shovel 5 so disposes itself that the center of gravity lies below the spindle 6, so that the shovel will swing'freely. In this posi- 5 Thereupon the haft 3 is swung outwardly so that it reaches the position shown in Figure 2. As the shovel is loosely suspended this swinging movement does not cause the contents to be discharged so 30 that theA shovel can be moved without danger from the extreme inward to the extreme outward position by a swinging movementbf the haft 3. The rope or cable I0 is loose and oiers no appreciable resistance to the position taken up by 35 the shovel 5.

IfV the shovel 5 is to be emptied this canv be effected in any position-even the most inwardof the shovel; this operation is shown in Figure 3. By means of the shovel tipping mechanism 40 the roller I4 is drawn downwardly and the rope I0 begins to tip the shovel. At first the segmental member 1 presses against the stops or projecting members 8. The pulley II is, how-- ever, not secured to the haft 3 but is provided to 45 move in a slot lla, and it is therefore pressed downwardly by the pull of the rope, the pressure of the spring 20 on the pulley carrier 2| being overcome in this movement. The pulley carrier -2I is-connected to the levers 22 whichmove the 5u stops or projecting members 3 in a 'f'direction parallel -with the pivotal axis of the shovel .and in this way withdraw them from the path of the segmental member 1 and allow the shovel to make the tipping movement. By means of the 55 tipping rope I0 the shovel 5 is then overturned until it reaches the position shown in Figure 3 and is completely emptied of its contents.

The shovel can be locked directly to the haft by bolts which are adapted to project into the track of one of the parts of the shovel. Such a construction is shown in Figures 6 and 7, according to Whichthe levers 22a act on the slides 8a, which constitute the stops or projecting members for the extended side walls 1a, of the shovel and are adapted to be withdrawn in the upward direction. The pulley H does not necessarily require to run in a guide slot but may instead be pivoted on a lever 25, as illustrated in Figure 8. In all the examples, however, the movement ofthe stops or projecting members, is automatic, the rope or its driving gear being capable of effecting the inward or outward movement of the stops or projecting members for the shovel according to the tension applied without any special manipulation.

The hydraulic shovel tipping mechanism may be replaced by any known mechanical driving means for controlling the stops or projecting members during the tipping of the shovel by the use of gearing rods or the like.

I claim:-

1. A drag-shovel excavator, comprising a shovel haft, a shovel pivotally mounted upon the said haft, movable restraining members upon the said lhaft for determining the position of the shovel restraining members and freeing the shovel in all positions of the haft.

2. A drag-shovel excavator, comprising a shovel haft, a shovel pivotally mounted upon the said haft, movable restraining members upon the said haft for determining the position of the shovel relatively to the haft in the digging movement, an operating element mounted upon and having limited longitudinal movement with respect to the haft, the said operating element being connected to the restraining members, a pulley supported upon said operating element, a flexible element connected to the shovel and passing over the said pulley, the said flexible element serving for tipping the shovel in all positions of the haft and for freeing the shovel from the restraining members, and a spring applied to the operating element to maintain the restraining members in the operative position.

3. A drag-shovel excavator according to claim 2, comprising levers connected between the restraining members and the operating element.

4. A drag shovel excavator comprising a jib, a shovel haft pivotally mounted on the said jib, a shovel pivotally mounted on the said haft, moveable restraining members upon the said haft for determining the position of the shovel relatively to the'haft in the digging movement, a spring mounted operating element provided upon and having longitudinal movement with respect to the haft, the said operating element being connected to the restraining members, and a exible element for tipping the shovel and engaging directly the said operating element to move it for the withdrawal of the restraining members in all positions of the haft.

HEINRICH SIEBERT. 

